Why is there a slight change of brightness or color when switching refresh rate on the POCO F7?

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If there is a slight change of brightness or color when switching refresh rate on the POCO F7, please refer to the following details:
1. To provide an improved and more consistent display experience, debugging and calibration have been carefully performed for each individual refresh rate setting;
2. As a result, when the screen's refresh rate changes dynamically, such as when switching between APPs or scrolling, you can notice a slight change in brightness;
3. This is a normal phenomenon caused by the adjustment process and doesn’t indicate a problem, nor does it affect the overall performance or usability of the phone.